Friday, July 13
• Cassiopeia is now well past its annual bottoming out due north. Look for its W pattern climbing low in the north-northeast after dark. The farther north you live, the higher it will be.
Saturday, July 14
• As twilight fades, see if you can catch the Moon over Mercury very low in the west, well to the lower right of Venus as shown here. Your best view may be about 45 minutes after sunset.
• One hour after sunset, as twilight fades further and the stars are coming out, you'll find the two brightest stars of summer, Vega and Arcturus, about equally near the zenith: Vega toward the east, shining very pale bluish white, and Arcturus toward the southwest, pale yellow-orange.
Sunday, July 15
• Moon and Venus: a lovely couple!Hanging dramatically in the west during twilight will be quite the eye-catcher: Venus and the crescent Moon closely paired. How closely depends on where you are. Seen at the time of dusk in North America's eastern...